Smilax jamesii is a species of flowering plant in the greenbriar family known by the common name English Peak greenbriar. It is to northern California, where it is known from the Klamath Mountains and the southernmost peaks of the Cascade Range. It has also been reported from nearby locations in southwestern Oregon. It grows in moist areas such as lakesides and streambanks in mountain coniferous forest habitat. It was discovered to be a new species when herbarium specimens thought to be Smilax californica were reexamined.
This is a rhizomatous perennial herb taking the form of a vine, climbing and branching to maximum lengths of 2 to 3 meters. The dark green leaves have blades up to 8 centimeters long by 7 wide, triangular to pointed oval in shape. There are numerous tendrils. The inflorescence is an umbel-shaped cluster of flowers blooming from the leaf axils. Male inflorescences contain up to 20 flowers, and the larger female inflorescences may have 40. The male and female flowers have similar petals but the female flower has a spherical ovary in the center. The mature fruit is a blue berry just under a centimeter wide which turns maroon in color as it dries.
- collected in Shasta County, California; specimen at University of California in Berkeley
- "Smilax jamesii". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 16 November 2015.
- Flora of North America
- Biota of North America Program, 2013 county distribution map
- The Nature Conservancy
- Wallace, G. A. (1979). An overlooked new species of Smilax (Smilacaceae) from Northern California. Brittonia 31:416-421.
- Jepson Manual Treatment
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